CN111159624A - Method for calculating heat supply coal consumption rate of new steam and extracted steam combined heat supply unit - Google Patents
Method for calculating heat supply coal consumption rate of new steam and extracted steam combined heat supply unit Download PDFInfo
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Abstract
The invention discloses a method for calculating heat supply coal consumption rate of a new steam and extracted steam combined heat supply unit. A method for converting the coal consumption rate of heat supply is disclosed, which is composed of two parts of coal consumption for heat supply and coal consumption for heat supply. A calculation model of the heat supply coal consumption rate is established, and particularly a mathematical model of converting the heat supply coal consumption after deducting the plant power consumption consumed by pure power generation by taking the heat supply share of the new steam as the weight is established. The method overcomes the defect that the existing algorithm for the heat supply coal consumption rate is basically a fixed value, reasonably distributes the fuel quantity consumed by heat supply and power generation, and solves the limitation that the existing algorithm is irrelevant to a heat supply mode. The new algorithm truly reflects the economy of power generation and heat supply during deep peak shaving of the unit, and is well applied in practice.
Description
Technical Field
The invention relates to a heat supply coal consumption rate of a new steam and steam extraction combined heat supply unit, in particular to a method for calculating the heat supply coal consumption rate during new steam heat supply.
Background
In recent years, the capacity and the heat supply area of a heat supply unit of a thermal power plant in the three north area are greatly increased, meanwhile, new energy units such as wind power and the like are also operated in a large-scale grid-connected mode, in order to absorb clean energy to the maximum extent, a power grid requires the heat supply unit to improve the peak regulation capacity, but for the existing heat supply unit, the load rate of the unit is only over 60-70%, the heat supply requirement during the heating period can be met, the deep peak regulation cannot be carried out, and particularly during the heating period in winter, the electric-thermal coupling contradiction is very prominent. In order to realize thermoelectric decoupling, some heat supply units adopt a steam extraction and boiler fresh steam combined external heat supply operation mode. The operation mode effectively improves the peak regulation capacity during heat supply and promotes the consumption of new energy, not only meets the heat supply requirement, but also can participate in the deep peak regulation of the power grid, and increases the income of the power plant according to the operation rule of the local electric power auxiliary service market.
For the steam extraction type heat supply type unit, the heat supply steam flow generates electricity and then supplies heat, the heat consumption of the steam turbine unit is distributed according to a heat method based on a first law of thermodynamics, the total amount of coal used for production is shared by coal used for electricity generation and coal used for heat supply according to the heat supply ratio, and the coal consumption rate for electricity generation and the coal consumption rate for heat supply are respectively calculated according to the coal used for electricity generation and the coal used for heat supply.
In practical application, the heat supply coal consumption rate is only related to the boiler efficiency and the pipeline efficiency, is unrelated to the heat supply mode, has small change of the boiler efficiency and small change of the heat supply coal consumption rate, and is basically a fixed value. The change of the heat supply mode leads the coal burning quantity to change, and all the coal burning quantity is classified as the coal consumption index of power generation and is not reflected in the coal consumption index of heat supply.
For a heat supply unit participating in deep peak shaving, the mode that partial steam of a boiler bypasses a steam turbine and directly supplies heat to the outside through a bypass is adopted to meet heat supply and reduce load. The new steam does not enter a steam turbine to do work, so that the coal consumption of the unit for generating electricity is increased; when the load is reduced, the performance of the steam turbine is reduced, the plant power consumption is increased, the coal consumption of the unit for generating electricity is increased, and the coal consumption of the power supply is also increased. When the heat supply quantity is constant, according to the existing heat supply coal consumption rate calculation method, the heat supply coal consumption is basically unchanged, the increased coal combustion quantity is completely distributed into the power generation coal consumption, and the new steam and steam extraction combined heat supply is more increased than that of pure steam extraction heat supply.
When the unit participates in deep peak shaving, under the same heat supply quantity, the fuel consumption of heat supply and power generation is shared by the existing method, the obtained income is not reflected in the coal consumption of power generation and power supply, and the existing method for calculating the heat supply coal consumption rate has the defects. Aiming at the new steam and extracted steam combined heating mode, the invention provides a method for converting the coal consumption rate of heat supply, overcomes the defect that the coal consumption rate of heat supply is basically a fixed value, and reasonably distributes the fuel quantity consumed by heat supply and power generation.
Disclosure of Invention
The invention aims to overcome the defects of the existing heating coal consumption rate calculation method, improves the existing method and provides a method for calculating the heating coal consumption rate of a new steam and steam extraction combined heating unit.
The technical scheme adopted by the invention for solving the problems is as follows: a method for calculating the heat supply coal consumption rate of a new steam and extracted steam combined heat supply unit is characterized in that the method is a method for calculating the heat supply coal consumption rate of the heat supply unit, and the heat supply coal consumption rate is a heat supply standard coal consumption rate and is used for evaluating the heat economy of the heat supply unit.
Establishing a calculation model of the heat supply coal consumption rate, wherein the heat supply coal consumption rate consists of two parts of heat supply coal consumption and heat supply electricity coal consumption;
the heat supply coal consumption expression is as follows:
the plant power consumption required by heat supply is shared after the plant power consumption consumed by pure power generation is deducted according to the weight of the new steam heat supply share;
the expression of the plant power consumption for heat supply is as follows:
the plant power consumption for heat supply is X (heat supply flow coefficient) (plant power-pure plant power consumption for power generation)
Furthermore, the heat supply unit refers to a unit that a steam turbine can simultaneously produce two products, namely electric energy and heat energy, and the heat energy supplies heat to the outside; the combined heat supply means that the new steam produced by the boiler is supplied with heat through the temperature and pressure reducing device and the extracted steam of a certain stage of the steam turbine.
Further, the temperature and pressure reducing device can be a high-pressure bypass device and a low-pressure bypass device of a steam turbine.
Furthermore, the heat supply flow coefficient is the ratio of the new steam flow to the total heat supply flow, and the ratio is between 0 and 1.
The calculation method comprises the following specific steps:
1) a heat supply flow coefficient; the ratio of the heat supply flow of the new steam to the total heat supply flow is shown in the formula (1):
2) the plant power consumption for heat supply; and (3) allocating the plant power consumption by deducting the pure plant power consumption for power generation, wherein the formula (2) is as follows:
Wgr＝λ×(Wcy-Wcf) (2)；
3) nominal plant power rate; and (3) deducting the ratio of the plant power consumption for pure power generation to the generated energy from the plant power consumption, wherein the ratio is expressed by the formula:
4) heat supply; subtracting the return water heat from the steam supply heat, see formula (4):
Qgr＝Dgr×hgr-Dhs×hhs(4)；
5) total heat consumption; the steam turbine obtains total heat (containing new steam direct heat supply heat) from the boiler, see formula (5):
Q0＝29308×ηgl×ηgd×B (5)；
6) and heat supply ratio; the ratio of the heat of heat supply to the total heat consumption of power generation and heat supply is shown in formula (6):
7) standard coal consumption for production; the sum of the standard coal-fired amounts for power generation and heat supply, see formula (7):
B＝Br+Bfd(7)；
8) standard coal burning quantity for heat supply; the sum of the heat supply and the standard coal-fired quantity converted from the required plant power consumption is shown in the formulas (8), (9) and (10):
Br＝Bgr+Byd(8)
the further derivation is:
it is further deduced that:
9) the heat supply coal consumption rate; the standard coal-fired quantity for supplying heat for unit heat energy consumption is shown in formulas (11), (12) and (13):
the further derivation is:
it is further deduced that:
ηgland ηgdThe calculation method is shown in an industrial standard DL/T904-2015 'calculation method for technical and economic indexes of thermal power plants';
description of the symbols:
lambda heat supply flow coefficient,%;
Dplcalculating the heat supply flow of the new steam in kg in the period;
Dcqcounting the steam extraction heat supply flow in kg;
Dgrcounting total heat supply flow in kg;
hgrheat supply steam enthalpy in a statistical period is kJ/kg;
Dhscounting the return water flow in kg in the period;
hhscounting the return water enthalpy in the period, kJ/kg;
α heat supply ratio,%;
Qgrcounting total heat supply, kJ, in a period;
Q0counting the total heat (including the heat of direct heat supply of new steam) entering the steam turbine in the period, kJ;
Wcycounting the plant power consumption in the period, kW.h;
Wcfcounting the plant power consumption, kW.h, consumed by pure power generation in the period;
Wgrcounting plant power consumption, kW & h, consumed by heat supply in a period;
generating capacity in a W statistical period, kW.h;
Brcounting the standard coal burning amount (kg) consumed by heat supply in the period;
Bfdcounting the standard coal burning amount, kg, consumed in power generation in a period;
b, counting the standard coal consumption in kg during production;
Bgrcounting the standard coal burning amount, kg, of heat supply conversion in the period;
Bcycalculating standard coal burning quantity, kg, converted from plant power consumption in the period;
ηglboiler efficiency in statistical period,%;
ηgdpipeline efficiency,%, during statistical period;
brcalculating the heat supply coal consumption rate in the period, kg/GJ;
29308 low calorific value, kJ/kg, per kilogram of standard coal.
Compared with the prior art, the invention has the following advantages and effects:
1. the method for calculating the heat supply coal consumption rate of the new steam and extraction steam combined heat supply unit provides a conversion method of the heat supply coal consumption rate, establishes a calculation model of the heat supply coal consumption rate, particularly establishes a mathematical model of the coal combustion amount converted by deducting the plant power consumption consumed by pure power generation from the plant power consumption by taking the heat supply share of the new steam as the weight, defines a method for distributing the heat supply coal and the power generation coal combustion amount, and solves the limitation that the existing algorithm is irrelevant to the heat supply mode.
2. The method for calculating the heat supply coal consumption rate of the new steam and extracted steam combined heat supply unit eliminates the defect that the existing algorithm of the heat supply coal consumption rate is basically a fixed value, reasonably distributes the fuel quantity consumed by heat supply and power supply, reflects the influence of the change of the heat supply mode on the heat supply coal consumption rate, truly reflects the economical efficiency of power generation and heat supply during deep peak shaving of the unit, and is well applied in practice.
3. The new steam and steam extraction combined heat supply unit calculates the heat supply coal consumption rate, the heat supply flow coefficient range is between 0 and 1, namely when no new steam supplies heat, the heat supply flow coefficient is 0, and a new algorithm of the heat supply coal consumption rate is consistent with the original algorithm; when all new steam is adopted for heat supply, the converted coal-fired quantity after the plant power consumption is deducted from the plant power consumption consumed by pure power generation is all shared for heat supply coal consumption, the physical meaning is clear, and the principle of who benefits and undertakes the cost is reflected.
Detailed Description
The present invention is further illustrated by the following examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
In this embodiment, a method for calculating a heat supply coal consumption rate of a new steam and extraction steam combined heat supply unit includes the following specific steps:
1) a heat supply flow coefficient; the ratio of the heat supply flow of the new steam to the total heat supply flow is shown in the formula (1):
2) the plant power consumption for heat supply; and (3) allocating the plant power consumption by deducting the pure plant power consumption for power generation, wherein the formula (2) is as follows:
Wgr＝λ×(Wcy-Wcf) (2)；
3) nominal plant power rate; and (3) deducting the ratio of the plant power consumption for pure power generation to the generated energy from the plant power consumption, wherein the ratio is expressed by the formula:
4) heat supply; subtracting the return water heat from the steam supply heat, see formula (4):
Qgr＝Dgr×hgr-Dhs×hhs(4)；
5) total heat consumption; the steam turbine obtains total heat (containing new steam direct heat supply heat) from the boiler, see formula (5):
Q0＝29308×ηgl×ηgd×B (5)；
6) and heat supply ratio; the ratio of the heat of heat supply to the total heat consumption of power generation and heat supply is shown in formula (6):
7) standard coal consumption for production; the sum of the standard coal-fired amounts for power generation and heat supply, see formula (7):
B＝Br+Bfd(7)；
8) standard coal burning quantity for heat supply; the sum of the heat supply and the standard coal-fired quantity converted from the required plant power consumption is shown in the formulas (8), (9) and (10):
Br＝Bgr+Byd(8)
the further derivation is:
it is further deduced that:
9) the heat supply coal consumption rate; the standard coal-fired quantity for supplying heat for unit heat energy consumption is shown in formulas (11), (12) and (13):
the further derivation is:
it is further deduced that:
ηgland ηgdThe calculation method is shown in an industrial standard DL/T904-2015 'calculation method for technical and economic indexes of thermal power plants';
description of the symbols:
lambda heat supply flow coefficient,%;
Dplcalculating the heat supply flow of the new steam in kg in the period;
Dcqcounting the steam extraction heat supply flow in kg;
Dgrcounting total heat supply flow in kg;
hgrheat supply steam enthalpy in a statistical period is kJ/kg;
Dhscounting the return water flow in kg in the period;
hhscounting the return water enthalpy in the period, kJ/kg;
α heat supply ratio,%;
Qgrcounting total heat supply, kJ, in a period;
Q0counting the total heat (including the heat of direct heat supply of new steam) entering the steam turbine in the period, kJ;
Wcycounting the plant power consumption in the period, kW.h;
Wcfcounting the plant power consumption, kW.h, consumed by pure power generation in the period;
Wgrcounting plant power consumption, kW & h, consumed by heat supply in a period;
generating capacity in a W statistical period, kW.h;
Brcounting the standard coal burning amount (kg) consumed by heat supply in the period;
Bfdcounting the standard coal burning amount, kg, consumed in power generation in a period;
b, counting the standard coal consumption in kg during production;
Bgrcounting the standard coal burning amount, kg, of heat supply conversion in the period;
Bcycalculating standard coal burning quantity, kg, converted from plant power consumption in the period;
ηglboiler efficiency in statistical period,%;
ηgdpipeline efficiency,%, during statistical period;
brcalculating the heat supply coal consumption rate in the period, kg/GJ;
29308 low calorific value, kJ/kg, per kilogram of standard coal.
The present invention is further described in detail below with reference to an embodiment of a 350MW supercritical steam turbine plant in which steam bypass and extraction of the turbine are combined to supply heat to the outside during deep peak shaving.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. A method for calculating the heat supply coal consumption rate of a new steam and extracted steam combined heat supply unit is characterized in that the method is a method for calculating the heat supply coal consumption rate of the heat supply unit, and the heat supply coal consumption rate is a heat supply standard coal consumption rate and is used for evaluating the heat economy of the heat supply unit;
establishing a calculation model of the heat supply coal consumption rate, wherein the heat supply coal consumption rate consists of two parts of heat supply coal consumption and heat supply electricity coal consumption;
the heat supply coal consumption expression is as follows:
the plant power consumption required by heat supply is shared after the plant power consumption consumed by pure power generation is deducted according to the weight of the new steam heat supply share;
the expression of the plant power consumption for heat supply is as follows:
the plant power consumption for heat supply is equal to the heat supply flow coefficient x (plant power consumption-plant power consumption for pure power generation).
2. The method for calculating the coal consumption rate of heat supply by using the fresh steam and extracted steam combined heat supply unit as claimed in claim 1, wherein the heat supply unit is a unit which can simultaneously produce two products, namely electric energy and heat energy, by using a steam turbine, and the heat energy supplies heat to the outside; the combined heat supply means that the new steam produced by the boiler is supplied with heat through the temperature and pressure reducing device and the extracted steam of a certain stage of the steam turbine.
3. The method for calculating the coal consumption rate of heat supply of the new steam and extracted steam combined heat supply unit as claimed in claim 2, wherein the temperature and pressure reducing devices are high-pressure and low-pressure bypass devices of a steam turbine.
4. The method for calculating the coal consumption rate of heat supply of the combined heat supply unit of fresh steam and extracted steam according to claim 1, wherein the heat supply flow coefficient is the ratio of the fresh steam flow to the total heat supply flow, and the ratio is between 0 and 1.
5. The method for calculating the coal consumption rate of heat supply of the new steam and extracted steam combined heat supply unit according to claim 1 or 4, which is characterized by comprising the following steps of:
1) a heat supply flow coefficient; the ratio of the heat supply flow of the new steam to the total heat supply flow is shown in the formula (1):
2) the plant power consumption for heat supply; and (3) allocating the plant power consumption by deducting the pure plant power consumption for power generation, wherein the formula (2) is as follows:
Wgr＝λ×(Wcy-Wcf) (2)；
3) nominal plant power rate; and (3) deducting the ratio of the plant power consumption for pure power generation to the generated energy from the plant power consumption, wherein the ratio is expressed by the formula:
4) heat supply; subtracting the return water heat from the steam supply heat, see formula (4):
Qgr＝Dgr×hgr-Dhs×hhs(4)；
5) total heat consumption; the steam turbine obtains total heat from the boiler, and the total heat contains new steam to directly supply heat, see formula (5):
Q0＝29308×ηgl×ηgd×B (5)；
6) and heat supply ratio; the ratio of the heat of heat supply to the total heat consumption of power generation and heat supply is shown in formula (6):
7) standard coal consumption for production; the sum of the standard coal-fired amounts for power generation and heat supply, see formula (7):
B＝Br+Bfd(7)；
8) standard coal burning quantity for heat supply; the sum of the heat supply and the standard coal-fired quantity converted from the required plant power consumption is shown in the formulas (8), (9) and (10):
Br＝Bgr+Byd(8)
the further derivation is:
it is further deduced that:
9) the heat supply coal consumption rate; the standard coal-fired quantity for supplying heat for unit heat energy consumption is shown in formulas (11), (12) and (13):
the further derivation is:
it is further deduced that:
ηgland ηgdThe calculation method is shown in an industrial standard DL/T904-2015 'calculation method for technical and economic indexes of thermal power plants';
description of the symbols:
lambda heat supply flow coefficient,%;
Dplcalculating the heat supply flow of the new steam in kg in the period;
Dcqcounting the steam extraction heat supply flow in kg;
Dgrcounting total heat supply flow in kg;
hgrheat supply steam enthalpy in a statistical period is kJ/kg;
Dhscounting the return water flow in kg in the period;
hhscounting the return water enthalpy in the period, kJ/kg;
α heat supply ratio,%;
Qgrcounting total heat supply, kJ, in a period;
Q0counting the total heat entering the steam turbine in the period, wherein the total heat contains the heat of direct heat supply of new steam, kJ;
Wcycounting the plant power consumption in the period, kW.h;
Wcfcounting the plant power consumption, kW.h, consumed by pure power generation in the period;
Wgrcounting plant power consumption, kW & h, consumed by heat supply in a period;
generating capacity in a W statistical period, kW.h;
Brcounting the standard coal burning amount (kg) consumed by heat supply in the period;
Bfdcounting the standard coal burning amount, kg, consumed in power generation in a period;
b, counting the standard coal consumption in kg during production;
Bgrcounting the standard coal burning amount, kg, of heat supply conversion in the period;
Bcycalculating standard coal burning quantity, kg, converted from plant power consumption in the period;
ηglboiler efficiency in statistical period,%;
ηgdpipeline efficiency,%, during statistical period;
brcalculating the heat supply coal consumption rate in the period, kg/GJ;
29308 low calorific value, kJ/kg, per kilogram of standard coal.
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| CN112069442A (en) * | 2020-08-04 | 2020-12-11 | 国网山东省电力公司电力科学研究院 | Coal-fired pressure reduction calculation method and system based on heat supply substitution of cogeneration unit |
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| CN112049701A (en) * | 2020-08-28 | 2020-12-08 | 中国联合工程有限公司 | Steam extraction and heat supply adjusting method for steam turbine for mixing new steam in heat supply power station |
| CN112049701B (en) * | 2020-08-28 | 2022-06-21 | 中国联合工程有限公司 | Steam turbine extraction and heat supply adjusting method for mixing new steam in heating power station |
| CN112435056A (en) * | 2020-11-19 | 2021-03-02 | 贵州乌江水电开发有限责任公司 | Real-time cost measuring and calculating method for coal-fired power plant based on production and financial data |
| CN112507534A (en) * | 2020-11-25 | 2021-03-16 | 山东电力研究院 | Conversion method and system for power supply coal consumption rate of cogeneration unit in heat supply period |
| CN112700350A (en) * | 2020-12-28 | 2021-04-23 | 润电能源科学技术有限公司 | Method and device for calculating coal consumption of heat supply influence power supply of cogeneration unit |
| CN113283701A (en) * | 2021-04-22 | 2021-08-20 | 李智才 | Power generation and heat supply coal consumption accounting system of thermal power generating unit in conventional operation mode |
| CN113283701B (en) * | 2021-04-22 | 2024-03-19 | 李智才 | Power generation and heat supply coal consumption accounting system under conventional operation mode of thermal power generating unit |
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